Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf0a72d63e82eae…

MALICIOUS

PDF

97.6 KB Created: 2021-07-04 23:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 073469d0fdbce032403f5aad794176ee SHA-1: acb068b1a442827ea5808a007557c1038183ba43 SHA-256: 9cf0a72d63e82eae9b187bb2f4a181e1e15165625157586d732d1857b65abb7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting. These links likely serve as a lure to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lezurak.pdf In PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wufitekaxoxajokunuzexi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/41275233825.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ad90d01b---10343683249.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/79214589709.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f6361507e4990c4b577130981c2d4c8c/ririg.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb471d4a41---bewukewunezejevawezerap.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/76488241583.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/94337366703.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/555c75ab75660f78b3ff0b4e7e960ff2/53567399378.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/feb2bfda0cdaec6094f590192f63768c/19663124930.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/tatuwenisepanifozom.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/knddimq06mt0r0vpuhos4996ta/80999468528.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/beda23130e577f74a28f4aeb3d27c2e4/pejasinipuwolomow.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/javukasazanadedinenax.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a579d574722---monekepifi.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizexosubigazamurubuwa.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/19115013587.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/54659880291.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e28726528---81005701254.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dad063839ffe552b96aabd1a96a8dd19/viwolilanulejeburerenixeb.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sotanedejusimopogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+boy+who+cried+wolf+picture+sequence+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 18096 bytes
SHA-256: 77913b6d52a84c57fe886152c3068706a489725cea8a45afe8ed49eb6ebb4a2d
font_02_sfnt_off00014ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECE 11104 bytes
SHA-256: c2b8c71edc287c70be1dc35675061a68d2a5e9057e5c7b6fd759af2ed77357dc
font_03_sfnt_off0001683e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1683E 3800 bytes
SHA-256: 2ac0ea0f353a69f9c983170237f86571e5c1ff52febc1b6f69d95980b853741e

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